An underwater explorer, Frederick “Fritz” Hanselmann is passionate about past civilizations and things that are lost and long forgotten below the sea’s surface. Hanselmann, lecturer and director of the underwater archaeology and exploration program in the Department of Marine Ecosystems and Society at the Rosenstiel School of Marine and Atmospheric Science, dives deep into Caribbean waters to study shipwrecks, caves, and submerged prehistoric sites to gain insight into humanity’s past and ultimately better understand who we are.